Le 19 août 2009 à 17:29, PCWiz a écrit :
Hi,
It would probably be a good idea to tell you guys some of the
methods I have tried. First of all, I've tried just using
NSFileManager and NSEnumerator to enumerate through the directory.
This didn't add up resource forks AND it didn't round up the sizes
to Finder's 4KB minimum block size so it was obviously inaccurate. I
also tried using the du -sk shell command (which returned folder
size in KB) with NSTask, and while it was mostly accurate, it
collapsed under heavy load. The next thing I tried was using the
Carbon File Manager API using this method by Dave DeLong:
http://github.com/davedelong/BuildCleaner/blob/b2712242b4eea1fff0e78a08b393a417e3019c8a/NSFileManager+FileSize.m
This method worked for some folders/files, but for others it
returned wildly innacurate numbers. The method I'm using right now
is probably the closest I've ever gotten:
#define MINBLOCK 4096
+ (long long)sizeOfFile:(NSString *)filePath
{
long long fileSize = 0;
// Check if item is file or folder
if ([[[[NSFileManager defaultManager] fileAttributesAtPath:filePath
traverseLink:NO] objectForKey:NSFileType]
isEqualTo:@"NSFileTypeRegular"]) {
fileSize = ((([[[NSFileManager defaultManager]
fileAttributesAtPath:filePath traverseLink:YES] fileSize] + MINBLOCK
- 1) / MINBLOCK) * MINBLOCK);
} else {
NSString *file;
NSNumber *fsize;
NSDictionary *fattrs;
NSDirectoryEnumerator *de;
de = [[NSFileManager defaultManager] enumeratorAtPath:filePath];
while(file = [de nextObject]) {
rsrcPath = [NSString stringWithFormat:@"%@/..namedfork/rsrc",
file];
fattrs = [de fileAttributes];
fsize = [fattrs objectForKey:NSFileSize];
if (![[fattrs valueForKey:NSFileType]
isEqualTo:NSFileTypeDirectory]) {
fileSize += ((([[fattrs valueForKey:NSFileSize] longLongValue] +
MINBLOCK - 1) / MINBLOCK) * MINBLOCK);
}
}
}
return fileSize;
}
As you can see it performs a quick check to see whether its a file
or a folder, then takes the appropriate actions to find the file
size. The folder size method rounds up the files to the 4KB minimum
block size. I think what this method needs is just to add up the
resource forks and then it would be totally accurate. I'm just
confused as to how I would do that.
Thanks
Use The Core Services File Manager API :
http://developer.apple.com/documentation/Performance/Conceptual/FileSystem/Articles/IteratingFiles.html
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